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A former Uber driver charged with committing sexual assaults in Boston and Milton in 2017

A Hyde Park man was arrested Friday and charged with raping a person in 2017, the second time this month Boston police said they have resolved a cold case sex crime investigation.

William A. Mancortes, 43, was scheduled to appear in Boston Municipal Court Friday on charges of two counts of rape and one count of indecent assault and battery on a person 14 years or over, police said.

Mancortes was also arrested by Milton police on a warrant from Quincy District Court charging him with aggravated rape and kidnapping in 2017, police said.

Mancortes faces another case in Quincy District Court in which he is charged with indecent assault and battery while he was working as an Uber driver last year, according to the Norfolk District Attorney’s office.


Mancortes has pleaded not guilty to those charges and is due back in court on Nov. 16, when he will likely be arraigned in the Milton case, the district attorney’s office said.

In June, Mancortes pleaded guilty in Dedham District Court to a charge of indecent assault and battery on a child, according to court records. He was given an 18-month suspended sentence, court records show.

Police provided no further information about the assaults in Boston and Milton.

In the Boston case, Mancortes was identified as the alleged assailant by forensic testing of biological evidence collected at the time of the assault, officials said.

Mancortes was scheduled to be arraigned Friday afternoon, but that was subject to change, officials said.

Earlier this month, forensic testing on sexual assault evidence collected at the time of the attacks led to the arrest of Ivan W. Cheung for allegedly raping two children and two women at knifepoint between 2003 and 2006.

Cheung has pleaded not guilty.

He was arrested after investigators linked DNA from a cigarette butt he had discarded at the South Bay Mall in June while under surveillance to evidence collected from the most recent attacks, police said.


DNA testing performed at the time of the attacks had shown that two assaults were carried out by the same person, but authorities could not identify the attacker. Cheung was not included in the national DNA database with profiles of people convicted of violent crimes and sexual assaults.

At a hearing on Thursday, Cheung’s bail of $1 million was lowered to $300,000, according to court documents. He will return to court for a probable cause hearing on Oct. 26.

Material from earlier Globe coverage was used in this report.

John R. Ellement can be reached at Follow him @JREbosglobe. Bailey Allen can be reached at Follow her on Twitter @baileyaallen.