According to police, Douglas stabbed Lisa and then himself several times with a knife in the driveway. Douglas then retreated into a parked van and Lisa was able to get away.
While first aid was performed on Lisa, Douglas emerged from the rear of the van with a number of stab wounds. He was transported to Carroll Hospital Center where he was pronounced dead at about 1:30 p.m., police said.
The Maryland State Police Homicide Unit is investigating the case.