A Silver Spring man admitted yesterday to raping a 13-year-old girl and acknowledged responsibility for a series of crimes in Silver Spring and Wheaton over nearly two years.

Jorge Rivera-Aleman, 39, faces a maximum sentence of three consecutive life terms after pleading guilty to one count of first-degree rape and two counts of first-degree sex offense before Judge John W. Debelius III in Montgomery County Circuit Court. He will be sentenced Dec. 2.

He also said he was responsible for assaults and burglaries from March 2003 to January 2005 involving eight victims in Silver Spring and Wheaton.

"The bottom line is that this plea and his acceptance of responsibility for these crimes virtually ensures that he will serve the rest of his life in prison," said Montgomery County State's Attorney Douglas F. Gansler.

Gansler said Rivera preyed on girls who arrived home alone, scouting out victims before attacking them.

The plea came in the case of a girl attacked in Silver Spring on Nov. 12, 2004. That day, a neighbor picked her up from a bus stop and gave her a ride home because it was raining, Gansler said. The driver saw her enter her home safely and left. When the girl went inside, she saw a closet door ajar. As she went to close it, a man hiding inside attacked her.

The man tied the girl's hands behind her back, engaged in a variety of sex acts and then raped her. After repeating the sex acts in an upstairs bathroom, the man fled, and the victim called 911 and her father for assistance, Gansler said.

Rivera-Aleman was arrested the morning of Jan. 17 after he attempted to break into a house in the 1100 block of Cresthaven Drive in Silver Spring, police said. A woman inside the house saw him trying to open a window and scared him off when she yelled. The woman then called 911 and described the would-be intruder's car.

Police spotted the car on New Hampshire Avenue minutes later, with Rivera-Aleman inside. The woman identified Rivera-Aleman as the man who tried to break into her house. Police said they found pantyhose and socks in two of his coat pockets.

Investigators say Rivera-Aleman matched the description of the suspect in several incidents in Montgomery. Later, they say, a DNA analysis matched him to attacks on five victims, including the 13-year-old.