A Maryland prisoner known as the “Aspen Hill rapist” for a series of attacks in the early 1980s pleaded guilty Monday to three additional rapes in Montgomery dating back to the late 1970s. Timothy J. Buzbee will be sentenced Thursday, and prosecutors said they will seek to have him locked up for an additional two consecutive life sentences.

Buzbee terrorized a swath of Montgomery, beginning in 1981. He was arrested a year later, and sent to prison. More recently, detectives trying to crack unsolved rapes gathered evidence still in storage from those crimes, and submitted samples for DNA analysis. The tests matched Buzbee, according to authorities, and he was indicted in 2009 for four additional cases.

Buzbee pleaded guilty to three counts of first-degree rape. As part of an agreement, prosecutors will seek a maximum of two consecutive life sentences. In making the announcement, Montgomery County States Attorney John McCarthy offered these details about the three cases to which Buzbee pleaded:

On April 14, 1977, about 7:50 p.m., a woman was walking along the 400 block of Venice Drive, in the Silver Spring area, when Buzbee approached and put his hand over her mouth. He told her he had a knife and threatened to kill her. He then forced her into a backyard, where he put his shirt over her face, forced her to the ground and raped her.

On June 3, 1978 , about 9:25 p.m., a woman was walking from a party when Buzbee jogged by her and bumped into her. He said “excuse me” and jogged away. When the victim got to a corner, Buzbee was waiting with a gun. He took her to the front yard of a home in the 1500 block of Baylor Drive, in the Rockville area, where he threatened to kill her if she did not undress. He then forced her onto the ground and raped her.

On Jan. 25, 1979 about 7 p.m., a woman was walking along the 12900 block of Valleywood Drive, in the Wheaton area, when Buzbee approached her. He threatened to kill her and raped her.