PITTSBURGH (KDKA) — A California man has been charged in two rapes in Pittsburgh.

Pittsburgh sex assault detective say the first rape happened in the South Side Flats inside a home on Wharton Street.

A 23-year-old woman told police 29-year-old Akaninyene Akan walked inside her home shortly after 1 a.m. on Sept. 4, 2010.

Akan allegedly acted like he was confused about where he was, told her he would kill her if she made a sound and then raped her.

Investigators say the second rape happened on Sept. 12, 2010 in the 3300-block of Parkview Avenue in Oakland.

The victim described her attacker as an African-American man, 5’7” to 5’8” with a muscular build. She said he spoke with an accent.

Akan is a native of Nigeria.

The victim told police Akan climbed through a bedroom window, raped her, told her he would kill her and went on to say that he killed an ex-girlfriend and her mother and said he spent seven years in jail for those murders.

Police say what ties Akan to both rapes is DNA from a cigarette he tossed during a routine interview.

Akan is a mechanical engineer who worked in Pittsburgh at the time of the assaults and then relocated to Orange County, California where he was arrested, jailed and then extradited to Allegheny County.

Watch & Listen LIVE