Three suspects have been arrested in connection with the murder of 20-year-old Arvada woman Alexis Bartell, who was killed while driving last week after a rock was shattered her windshield. Officials say suspects targeted Bartell’s car with a large rock as part of a string of similiar incidents that began on April 19.

Joseph Koenig, Nicholas “Mitch” Karol-Chik and Zachary Kwak, each 18 years old, are charged with murder with extreme indifference for their alleged roles, Jefferson County Sheriff’s Office said. The First Judicial District Attorney’s Office could add more charges, officials said April 26, when they announced the arrests and charges.

While the sheriff's office declined to identify which schools the suspects attend, all three are currrent students; one attends Ralston Valley High School, one attends Standley Lake High School and one is enrolled in online schooling. 

All three suspects are believed to have partaken in the rock throwing, which officials believe are connected to a series of similar incidents in Arvada, Westminster, Boulder and Jefferson counties at night over the course of two-and-a-half hours, leaving two other drivers with minor injuries.

Jefferson County deputies worked with police  across the area to apprehend the suspects.

Bartell was talking to a friend on the phone as she drove northbound on the 10600 block of Indiana Street at around 10:45 p.m. on April 19 when the phone line went silent. That's when officials believe the rock hit her car, killing her.

Bartell's friend on the phone tracked Bartell’s location to a field where her car had crashed. Bartell was found dead inside her car.

Seven incidents occurred in total. The first incident occurred around 10 p.m., while the final incident was reported around 12:24 a.m. on April 20.

Bartell's family cancelled a planned press conference for April 26 after news of the arrests broke.