A homeless man wanted in connection with the rape and murder of an 89-year-old widow is on police bail over another alleged sex attack.
Scott Thompson has a distinctive scar above his left eye
Scott Thompson is a suspect in the murder of Catherine Grosstephan in Theydon Bois, Essex.
The Metropolitan Police are carrying out an inquiry after a middle-aged woman accused him of raping her at knife point in April, police said.
Mr Thompson may have been seen near Mrs Grosstephan's home before she died.
Det Sup Tim Wills, heading the inquiry, said Mr Thompson had twice been accused of raping women in London - one alleged victim was in her 40s and another in her 50s.
The first allegation had been made some years ago but the prosecution was dropped for lack of evidence.
A second accusation was made in April when Mr Thompson was alleged to have been armed with a knife.
"Thompson is on police bail after being arrested following that allegation," said Mr Wills.
"That allegation is currently being investigated by the Metropolitan Police."
Officers are following up a number of possible sightings of Thompson in Theydon Bois just before Mrs Grosstephan's murder.
Mrs Grosstephan's body was found in the lounge of her home last Friday.
Catherine Grosstephan was found dead at her home
Police believe she was suffocated or strangled some time between 1900 BST on Thursday and 1100 BST on Friday.
Detectives named Mr Thompson as a man they wanted to question after forensic tests confirmed that Mrs Grosstephan had been raped.
He is 23, 5ft 9ins tall, has short mousey hair and a distinctive scar above his left eyebrow.
Liam Brigginshaw, Assistant Chief Constable of Essex, said: "Thompson is a dangerous individual.
"He is known to carry a knife and we are aware of two other incidents in which allegations of rape have been made against him - one in London where an investigation is still continuing."
Police said he came from Kent but had connections in Glasgow, Leicestershire and east London.