DENVER (KDVR) — Police say the suspect in a deadly stabbing on an RTD bus Thursday is also connected to a second stabbing death later in the morning at a bus stop near Regis University.

Vinchenzo Moscoso, 29, was arrested in the 5500 block of North Lowell Boulevard, the Denver Police Department said Thursday just after 3:45 p.m.

He faces two counts of first-degree murder in the killings of a 51-year-old man on an RTD bus and an older woman near the Regis University campus. Police say both victims were stabbed in the neck.

“Based on evidence recovered and surveillance video a detective reviewed late this morning from the homicide that occurred on the bus, investigators believe Moscoso to be responsible for both of these homicides,” the department said in a release.

Stabbing on RTD bus on Federal

The first stabbing happened around 5:10 a.m. on an RTD bus at 32nd Avenue and Federal Boulevard. Surveillance video showed an “uneventful ride” until the suspect boarded at 5:08 a.m. near 32nd and Federal, according to his arrest warrant.

The bus driver told police the suspect got on the bus and paid $5, saying he couldn’t find his bus pass, according to an arrest warrant for Moscoso. Still, the driver gave him a $6 day fare.

Surveillance video shows what happened, according to the arrest warrant: “He then walked directly to the back of the bus and immediately, without provocation or warning, began stabbing the victim in the left side of his neck, with an object in his right hand.”

Another witness told police that he had his headphones on when he noticed passengers rush forward, and one “made a punching or stabbing motion.” The witness saw a man standing over the victim and “blood everywhere.” He tried to render aid while, according to what police saw on video, the suspect “calmly exited the back door.”

Police responded and found the wounded man, who was transported to a hospital and pronounced dead.

Stabbing at RTD bus stop near Regis University

Five hours later, a second stabbing took place around 9:50 a.m. near West 50th Avenue and North Federal Boulevard. Police said a woman was found dead at a bus stop next to the sports field at Regis University.

Regis sent out an alert issuing a shelter-in-place order. That alert was lifted after the suspect was arrested just down the street from the campus at 55th Avenue and Lowell. It’s where police cordoned off an area, where a backpack lay on a sidewalk.

A probable cause statement in the suspect’s arrest gives more detail about a witness to the second stabbing. Someone who was picking up trash for Regis University saw the woman walking on West 50th just a few minutes before he saw her lying on the ground bleeding.

The witness told police the suspect was standing near her, shirtless, and walked away westbound toward campus, according to the document. Police then found Moscoso near 55th and Lowell with blood on his hands and with a bloody knife in his front pocket.

A witness identified Moscoso as the person he saw next to the stabbing victim. Surveillance video also showed someone matching Moscoso’s description attacking the victim, according to the arrest document.

Police said a motive remains under investigation.

Bus drivers have safety concerns

Violence on buses and at bus stops has been a problem in the past, the union representing bus drivers told FOX31’s Vicente Arenas.

Drivers say they have continuing concerns about security on buses and trains.