A 22-year-old college senior, who was to have graduated this weekend, died in Baltimore yesterday after being wounded Sunday by a gunman who shot her and her boyfriend on a secluded suburban lovers' lane, authorities said. A spokeswoman for the University of Maryland Hospital said Catherine Marie Britt died at 11:15 a.m.

Britt was shot in the head while sitting in her boyfriend's car in a rural section of suburban Cockeysville. She was to have graduated next Sunday from Towson State University. Her companion, James Rhodes, 23, of Bel Air, remained in serious condition at the same hospital with a gunshot wound in the chest.

After the shooting, Rhodes drove himself and Britt to her apartment complex, where neighbors summoned help. In a similar, unrelated shooting, another couple was shot on a lovers' lane about 2 1/2 miles from the scene of Sunday's shooting. Both Ronald Quinley, 27, of Westminster, and Jill Mallison, 23, of Lutherville, have been released from the hospital since that April 16 shooting, police reported.

Authorities said that the same type of gun, a .25-caliber automatic pistol, was used in the two cases, and have warned couples to stay away from secluded areas. "We are very concerned about this; we've got a guy out there who is definitely homicidal," said Maj. Joseph H. Zerhusen, a member of the Baltimore County police task force investigating the shootings.