DENVER — The Denver Police Department is hoping the public can help investigators identify those involved in two shootings that left a security officer dead and another person seriously injured in Lower Downtown on Friday.

Police said the shootings happened near 15th and Market streets shortly before 2 a.m. Friday.

Police say a man shot the security officer, 28-year-old Lucardio Kroener, during a fight while Kroener confronted the suspect about a different shooting that had happened a short time earlier.

On Sunday, police released several pictures of two people they believe were involved in the shootings.

Images appear to show a white man and a black man. Police said both men assaulted the first gunshot victim.

Police believe the black man then shot and killed Kroener.

Anyone with information is asked to call 720-913-2000 or Metro Denver Crime Stoppers at 720-913-7867.

Anyone with cellphone video of either incident can to email a copy to police.