DNA evidence links a man to three sexual assaults over a period of more than a decade

A former California city employee has been arrested after being linked to a string of sex offenses dating back to 2010.

Kabeh Cummings, 35, was extradited to Sacramento after his August 29 arrest in New York City.

Mr Cummings faces more than 10 counts of rape, kidnapping and sodomy in connection with three sexual assault cases that remained unsolved until last year.

Prosecutors said during a news conference on Tuesday that the first victim was strangled and raped before the suspect fled the scene with her purse. Just weeks later, in March 2010, a second unconscious victim was sexually assaulted in a parking lot.

Then, in September 2013, the Sacramento Sheriff's Office received reports from a third woman who said she was raped by a man who pointed a stun gun at her. Although the DNA from the collected rape kits linked the same suspect to the first two crime scenes, it did not match the DNA of anyone in a national database.

Additional testing on material collected in the 2013 case allowed investigators to develop a special DNA profile that eventually led to the identification of a suspect and a connection to the 2010 rapes, said Sacramento Police Chief Kathy Lester.

In recent years, genetic genealogy has increasingly been used where other clues have been exhausted. The technology creates family trees using available DNA, allowing law enforcement to make connections between potential suspects and their relatives.

According to ABC10, police were monitoring Mr Cummings and taking DNA samples from his trash, which later matched DNA from the three crime scenes.

“As the years went by, I kind of lost hope. I feel justice is being done, I have my degree,” one of Mr Cummings' alleged victims told the network. “I know who he is, I know he's going to pay for it [what he did.]”

Mr. Cummings was employed at a city-funded after-school program between 2008 and 2014.

He was booked into the Sacramento County Jail on Friday and his bail was set at $3.5 million.

If convicted on all charges, Mr. Cummings faces 180 years in prison.

Authorities believe Mr Cummings may be linked to other sex crimes. Anyone with information is urged to call the case tip hotline at 916-808-1773.