BROOKLYN - Police are searching for a 23-year-old man who they say went on a deadly stabbing spree in Sheepshead Bay that spanned 11 hours.

According to authorities, Maksim Gelman stabbed his stepfather, Aleksandr Kuznetsov, numerous times at around 5 a.m. yesterday. Police found the 54-year-old's body inside his home on East 27th Street after receiving a 911 call.

About 11 hours later, police received another 911 call reporting a stabbing just a few blocks away on East 24th Street. When they arrived, officers say they discovered the bodies of Gelman's girlfriend, 20-year-old Yelena Bulchenko, and her mother, 56-year-old Anna Bulchenko.

Officials say Gelman escaped in a stolen grey Lexus and drove a few blocks north where he carjacked a green Pontiac Bonneville after stabbing its male driver three times. He then continued driving, striking a pedestrian at the intersection of Avenue R and Ocean Avenue. The pedestrian died later in the hospital. The driver is in stable condition.

Gelman is described as 6 feet tall and weighing approximately 170 pounds. Anyone with information is urged to call Crime Stoppers at 1-800-577-TIPS.

Associated Press reports contributed to this article.