WESTMINSTER, Colo. -- A deadly attack in Westminster rocked a residential neighborhood over the weekend.
A woman was stabbed to death by her son moments after she ran to a neighbor’s house for help, according to witnesses.
The Westminster Police Department said the mother was not the only victim.
Adrian Luis Ramirez, 23, was arrested at the scene and stands accused of stabbing his mother and sister.
"It's really chilling to know that it happened right in front of my house,” neighbor Marcus Smith said.
Neighbors who witnessed portions of the attack said Ramirez started by stabbing his sister at their mom’s home near West 76th Avenue and Lowell Boulevard.
Neighbors suspect Ramirez suffers from a mental disorder.
During the altercation, neighbors said Ramirez followed his mom to the next-door neighbor’s home where she sought help. Ramirez reportedly bashed his mom’s head against the neighbor’s front door.
The homeowner on Sunday worked to wash away blood leftover from the Saturday night attack. Witnesses said Ramirez dragged his mom away from the neighbor’s home and repeatedly stabbed her.
"She was not responsive to officers when they arrived on scene,” Westminster police investigator Cheri Spottke said.
The mom died from her injuries. The sister was last reported in critical condition at a hospital.
Police would not comment on a possible motive late Sunday. Saturday night’s incident was not the first time police had been called to the house, according to neighbors.
Police arrested Ramirez at the house without incident. Authorities have not released the victims’ names.
Along with first-degree murder and criminal attempt to commit first-degree murder, Ramirez also faces a child abuse complaint.
Three children younger than 10 were at the home during the attack, according to police. Those children were not physically injured.