Police said the three women were found dead from "blunt force trauma" at a home on Perry Street about 2:15 a.m., Newsday reported.
Authorities said Vanderhall's behavior had become more troubling recently, leading his mother to obtain an order of protection against him - and then to evict him.
A mother, her daughter and her daughter's friend were bludgeoned to death with a hammer in a house in Hempstead, police said.. He obtained a large hammer. The fourth female victim - who was also struck with the hammer - was transported to a local hospital where she is listed in stable condition.
Vanderhall found the last victim, 29-year-old Janel Simpson, in an upstairs room. Investigators say Bobby Vanderhall had been kicked out of his house by his mother and was homeless, causing him to become enraged.
"The family right now is distraught", said Juanita Johnson, a cousin of the Vanderhalls to NBC New York.More news: Taylor Swift Trial: Here's What's Happened and What to Expect Monday
"She was covered in blood", said Sykes, who called 911.
Vanderhall, who police described as more than six feet tall and at least 230 pounds, was arrested within two miles of the house after police found him asleep in a vehicle. "The most attractive memory of my daughter was her smile, her love, she was so protective of me", said Wendy Simpson, the mother of one of the victims.
He described his daughter and her friends as fun-loving women who went to Carnival in Trinidad and were planning to visit Cuba in the fall.
Sunday morning he will be arraigned on three counts of murder and one count of attempted murder. It was revealed he had a history of mental problems and a criminal record that included sexual abuse charges and DWI.