SAN DIEGO -- A 19-year-old Tierrasanta man who allegedly followed a woman into her Grantville-area apartment and sexually assaulted her at gunpoint is also accused of robbing another woman in the same area a month earlier, a prosecutor said Monday.

Londrea Raymond was arrested about 1:45 a.m. last Thursday, about three hours after an alleged sexual assault on a 26-year-old woman, authorities said. Police said the assailant got away with the victim's laptop computer and cell phone.

Raymond pleaded not guilty today to charges of forcible oral copulation, rape, burglary and robbery with the use of a firearm.

He was also charged with robbery with the use of a firearm for a crime that he allegedly committed last Dec. 30.

Deputy District Attorney Lucille Weismantel told Judge Francis Devaney that the two alleged victims lived close to one another; that both were strangers to the defendant; and that Raymond was armed during both crimes. Weismantel said Raymond made certain admissions as to his intent after his arrest.

After the first victim was robbed, police were looking for someone matching the defendant's description, the prosecutor said.

She told the judge that Raymond was a "grave danger" to the community and a threat to flee because he told police he was a transient when he was taken into custody.

The defendant -- who was ordered held on $1 million bail -- faces 183 years to life in prison if convicted of six charges, Weismantel said.