Mona Lilian Tinsley (14 November 1926 - 6 January 1937) was a British schoolgirl and the victim of a child murder which resulted in major amendments to the criminal law of England and Wales.

On 5 January 1937, 10-year-old Mona Tinsley disappeared after leaving her Newark-on-Trent school. A former lodger of Mona's parents, Frederick Nodder—known to Mona and her siblings as "Uncle Fred"—became the prime suspect in her abduction and suspected murder. However, despite the fact both strong physical and circumstantial evidence existed attesting to his guilt, because no body could be found, Nodder could not be tried for Mona's murder, but was instead convicted of her abduction and unlawful detainment and sentenced to seven years in gaol.

Mona's strangled body was recovered from the River Idle on 6 June; the discovery of her body enabled authorities to charge Nodder with her murder. He was found guilty of Mona's murder and hanged at Lincoln Prison on 30 December 1937.

The murder of Mona Tinsley was a case study cited in English law as leading to the abolition of the no body, no murder principle. This principle was abolished in 1954. As such, a murder conviction can now be obtained in England and Wales based on sufficiently compelling and convincing circumstantial evidence. Nodder himself has been described by one author as the Man Who Said Nothing due to his refusal to disclose the whereabouts of Mona's body and her subsequent discovery enabling, via contemporary legal statutes, his trial, conviction and execution for her murder.

Early life Mona Lilian Tinsley was born in Newark-on-Trent, Nottinghamshire, on 14 November 1926. She was the fourth of seven children born to Wilfred Edward and Lilian Ada (née Scott) Tinsley, who had married in 1920. The Tinsley family were working-class and close-knit, and resided in a council house on Thoresby Avenue. Mona's father was employed as a coal deliveryman; her mother was a housewife. To supplement the family income, the Tinsleys occasionally allowed lodgers to rent an upstairs room in their property.

By January 1937, Mona had recently celebrated her tenth birthday. She was slightly short for her age, with a somewhat protective attitude towards her younger siblings, and wore her dark hair in a bobbed cut with a prominent fringe fashionable with girls in the 1930s. Mona's mother later described her middle child as being "a lovely child ... very sharp and intelligent. She was loved by everybody, both at school and [a]round her home."

Disappearance On the afternoon of Tuesday 5 January 1937, Mona disappeared shortly after leaving the Guildhall Street Methodist School in Newark-on-Trent to walk home at the end of the school day. Mona's school was approximately twenty minutes' walk from her home, and she would typically walk home either alone, with her younger sister, Edith Brenda, or with friends, arriving home at approximately 4.10 p.m. Several of her classmates later informed police that on this date, Mona began her walk home alone.

When Mona had not arrived home by 4.30 p.m., her parents—having initially assumed their daughter had briefly encountered or visited a friend or relative en route home—became anxious. By 5 p.m., her father, Wilfred, began searching the streets, enquiring in local shops and visiting Mona's friends' homes in the hope of locating his daughter.

That evening, Wilfred and Lilian Tinsley reported their daughter missing to Nottingham City Police, who promised to launch an intense manhunt for the child at daybreak. The following morning, an intense search was mounted, with Chief Constable Harry Barnes assigned overall charge of the investigation. This search involved the questioning of potential eyewitnesses, canals and rivers being dragged, extensive door-to-door enquiries, and empty properties being searched. The police search was assisted by approximately six-hundred local volunteers.

Investigation One of the initial avenues of police enquiry was to question Mona's classmates; one of whom, William Plackett, informed officers that he had seen Mona standing close to a butcher's shop on Guildhall Street shortly after their school had closed for the day. Plackett also stated Mona had been standing approximately () from a man he did not recognise.

In response to extensive police and media appeals, two eyewitnesses also informed investigators on the afternoon of 6 January that they had seen Mona at a bus station the previous afternoon and that she had been in the company of a middle-aged man approximately 45 years old, () in height and with a small, ginger moustache. This individual had been wearing a trilby hat and a distinctive fawn raincoat, and the eyewitnesses had seen Mona in the company of this individual at approximately 4.45 p.m. One of these individuals was able to identify this man as a former lodger of the Tinsleys; the other eyewitness—a neighbour of Mona's—stated the man had been notably wary in demeanour.

A neighbour of the Tinsley family, Annie Herd, also informed the police that she had seen a former lodger of the Tinsleys standing alone, loitering on the corner of Guildhall Street, close to Mona's school, staring in the direction of the entrance to the premises on the afternoon of her disappearance. Later that day, a bus conductor named Charles Edward Reville confirmed to police that the previous day, a young girl matching Mona's description had boarded his 4.45 p.m. bus from Newark to Retford in the company of a middle-aged man, and the pair had alighted his bus at Grove Street, Retford. Reville added that this man had displayed a return ticket for himself, before purchasing a single half-fare ticket for the girl. Reville's claims were independently substantiated by a passenger on the bus named Stanley Betts, who also claimed to have seen a middle-aged man travelling between Newark and Retford with a girl matching Mona's description.

Suspect identification Police questioning of Mona's parents in relation to these eyewitness statements revealed this former lodger's name to be Frederick Hudson, with Lilian Tinsley adding that they had been introduced to Hudson in 1935 by her sister, Edith Grimes, with whom Hudson had previously lodged in Sheffield. The Tinsleys explained that after Hudson left the Grimes household in October 1935, he had briefly lodged with them, but that they had evicted him from their home after just three weeks for non-payment of rent. Nonetheless, Wilfred and Lilian Tinsley emphasized that his departure from their household had been upon amicable terms, adding that in the short space of time Hudson had lodged in their household, he had been popular with their seven children, who had all come to know him as "Uncle Fred".

In efforts to locate Hudson's current address, investigators contacted Edith Grimes, who stated the man her sister knew as Frederick Hudson was actually a 49-year-old father-of-two named Frederick Nodder, who had adopted the surname Hudson as an alias, since becoming the subject of an affiliation order. Grimes described Nodder as being a brutish and squalid drunkard with poor personal hygiene and few friends, who worked primarily as a motor mechanic and lorry driver in Retford. Nodder had, Grimes stated, deserted his wife many years before he had lodged with her. However, she claimed to be unaware of Nodder's current address, and to have not seen him for several months. Enquiries in public houses and garages in Retford quickly led officers to the Retford haulage firm with which Nodder had been employed; this firm was able to provide police with Nodder's current address on Smeath Road in the Nottinghamshire village of Hayton, adding he had ceased working for the firm on 29 December.

Formal questioning In the late evening of 6 January, police drove from Newark-on-Trent to Hayton to formally question Nodder. When shown a photograph of Mona and asked if he knew the child, Nodder confirmed he did indeed "used to" know her, but claimed not to have seen Mona for approximately fifteen months, following his eviction from the Tinsley household. When informed the child was missing, Nodder replied: "I know nothing at all about it." Questioned as to his movements the previous day, Nodder confirmed he had been in Newark, but claimed that he had simply been looking for work. He further claimed to have returned to Retford alone on the 3.45 p.m. bus (approximately ten minutes before Mona is believed to have been abducted), arriving in Hayton later in the afternoon.

Police questioning of Nodder's neighbours produced a witness who had seen a young girl matching Mona's description at Nodder's premises earlier that day; another neighbour, Doreen Jarman, was able to confirm to police that at midday on 6 January, a young brunette girl wearing a pale blue dress had been standing in the back doorway of his house, watching Nodder digging in his garden. The combination of eyewitness testimony and circumstantial evidence was sufficient to detain Nodder pending further enquiries. He was arrested on a bastardy warrant at 11 p.m. that evening (police having learned from Edith Grimes that Nodder had been the subject of an affiliation order), and both his three-bedroom home (known as "Peacehaven") and garden extensively searched. Over the following days, every house, drain, ditch and cesspit within a three-mile radius of Nodder's property was also searched.

Initial statement On the morning of 7 January, Nodder was placed in an identity parade at Newark police station; each of the witnesses who had seen Mona on 5 and 6 January did not hesitate to pick him out as the man they had seen in her company. Confronted with these positive identifications, Nodder changed his story the following morning, informing a Detective Sergeant Francis to bring Edith Grimes to the station, stating: "If you will get Mrs. Grimes to see me, I'll make a statement which will lead to the finding of Mona Tinsley alive and well."

In his initial statement, given on the evening of 8 January, Nodder claimed he had encountered Mona by chance outside her school, and that upon recognizing him, Mona had cheerfully exclaimed, "Hullo, Uncle Fred!" before asking him to take her to visit her aunt (Edith Grimes) in Sheffield in order that she could see her newborn cousin, whom she had not yet seen. Reluctantly, he had agreed to Mona's request, as he had expected to see Mrs. Grimes the following day as the two had an agreement to meet once a week via their affair. He had therefore persuaded Mona to spend the evening at his home before giving the child two shillings and travelling with her on a bus "from Retford to "Worksop" in the early evening of 6 January, with instructions—both verbal and written—as to how to reach her aunt's home in Neill Road, Sheffield, and a note of explanation for her visit to Mrs. Grimes. He had then returned back home to Hayton by bus. This arrangement would therefore ensure Nodder was alone when Mrs. Grimes visited him at their pre-scheduled meeting time, and that upon Edith's return to Sheffield, Mona would already be with her family at her home. Nodder further stated Edith Grimes could assist police with their investigation; adding she had known his address but alleging she had withheld this information from the police.

Upon Edith Grimes's arrival at Newark police station, Nodder asked her, "Is Mona at your house?" When she replied the child was not, Nodder replied, "Well, I am responsible."

Further developments