Arrest Made in Sabina Rose O'Donnell Rape, Murder Case

PHILADELPHIA (CBS/AP/KYW) Two weeks to the day after 20-year-old Sabina Rose O'Donnell was brutally raped and strangled to death in an empty lot, Philadelphia police have announced they have arrested the person they believe is responsible, 18-year-old Donte Johnson.

PICTURES: Sabina Rose O'Donnell

Police say that an anonymous tip, received five days after police released a video of the man who they believe followed Sabina as she rode her bike to her stepfather's house, led to the arrest of the teenager.

Sources have told the Philadelphia Inquirer that Johnson has already confessed and claims that he initially followed her because he wanted her bike.

"We're very encouraged by what we have so far," Police Commissioner Charles H. Ramsey told reporters Wednesday morning.

Surveillance cameras last week captured images of a man who biked in aimless circles for almost an hour before he crossed paths with Sabina Rose O'Donnell.

Police Capt. James Clark said Thursday that the bicyclist then appeared to follow her to her stepfather's home in the Northern Liberties neighboorhood of Philadelphia moments before she was sexually assaulted, beaten and strangled, reportedly by her own bra, shortly before 3 a.m. on June 2, according to CBS affiliate KYW.

A neighbor walking her dog spotted the victim's body at about 9:30 a.m. June 3.