Charles Allen Lechmere (1849–1920), also known as Charles Cross, was the meat cart driver who "discovered" the body of Polly Nichols. According to the theory, Lechmere lied to police, claiming that he had been with Nichols's body for a few minutes, whereas research on his route to work from his home demonstrated that he must have been with her for about nine minutes. In addition, he did not report seeing or hearing anyone else in Buck's Row, which had no side exits.
It was theorized that Lechmere had killed Nichols and begun the process of mutilating her body when he heard a policeman approaching, and then rushed to portray himself as the discoverer of her body. Lechmere's home address, visits to family, and route to work link him to the times and places of murders; he passed three streets where Martha Tabram, Polly Nichols, and Annie Chapman were murdered roughly at the same time the murders are estimated to have occurred. The "Double Event" murders of Elizabeth Stride and Catherine Eddowes occurred on a Saturday, his only night off from work: Stride was killed near Lechmere's mother's house in an area he grew up in, and the direct route from Stride's murder scene to the location of Eddowes's murder followed a path to Lechmere's route to work that he had used for twenty years.
Mary Kelly was also murdered on his route to work, and the time frame in which she is estimated to have been killed matches his route, although the day she was killed was a holiday and he may have had the day off.
Lechmere's family background is also similar to that of many serial killers: he grew up in a "broken home"; having never known his biological father, he had two stepfathers; and his childhood was characterized by an instability of residence, growing up in a series of different homes. In addition, his occupation as a meat cart driver would have allowed his blood-splattered appearance to escape suspicion. Holmgren believes that Lechmere may have been responsible for several other murders in addition to those of the canonical five victims and Martha Tabram.