Maksim Gelman's violent spree included three deadly stabbings, a hit-and-run fatality and multiple carjackings, police said.
Gelman, 23, allegedly killed his stepfather, his ex-girlfriend and her mother with a kitchen knife and fatally hit a pedestrian during his wild rampage, according to the New York Daily News.
The violence began early Friday morning, when Gelman showed up at his family's Brooklyn apartment and demanded to use a car, police sources told The New York Post. When his stepfather, Alexsandr Kuznetsov, refused to hand him the keys, cops said Gelman stabbed the 54-year-old man to death and fled.
Later that day, Gelman allegedly went to the home of former girlfriend Yelena Bulchenko, 20, killing her and her mother, Anna, 56. Both women were stabbed more than a dozen times, the Daily News reported.
Police said Gelman then hijacked a vehicle, stabbing and wounding the driver before striking a 62-year-old pedestrian, Stephen Tannenbaum, who later died from his injuries, The New York Times reported.
The rampage continued this morning, when Gelman allegedly boarded a subway train and stabbed a male passenger in the head and chest. That man is in critical condition, the Daily News said.
Following the subway attack, Gelman boarded another train, the newspaper reported. Officers caught up with him at the Times Square subway station. Cops said he was carrying a bloody knife when arrested.
Gelman has 10 prior arrests, including a drug bust last week, according to The New York Post. His mother told police he appeared high when he attacked his stepfather.
"That guy's got a bit of a reputation around here," a friend of Telena Bulchenko's told the Post. "You took one look at him and you thought he was on pills."