Case:  25-2100985
 
Date:  Tuesday, July 29, 2025
 
Time:  4:11 p.m.
 
Location:  1907 Pennsylvania Avenue
 
Victim (Deceased):  Kimberly Sullivan, White female, 05/02/1983

Suspect (Deceased):  Jon Nickowski, White male, 05/16/1975
 
On Tuesday, July 29, 2025, at approximately 4:11 p.m., Austin Police Officers (APD) responded to reports of a deceased person at 1907 Pennsylvania Avenue. The caller was delivering a package when they located a man on the ground who was bleeding. When officers arrived on the scene, they located a male on the ground, later identified as Jon Nickowski, with trauma to his body and a firearm next to him. Officers also located a female within the residence, later identified as Kimberly Sullivan, who appeared to have been shot multiple times. Both Nickowski and Sullivan were pronounced deceased at 4:29 p.m.
 
Homicide Detectives and Crime Scene Specialists responded to process the scene and interview witnesses. The investigation revealed that Nickowski had shot and killed Sullivan before shooting himself. Additional findings showed that the two had been in a dating relationship for several years.
 
Anyone with information is asked to contact the Austin Police Department at 512-974-TIPS. You may submit your tip anonymously through the Capital Area Crime Stoppers Program by visiting austincrimestoppers.org or calling 512-472-8477. A reward of up to $1,000 may be available for any information that leads to an arrest.
 
This case is being investigated as Austin's 35th homicide of 2025.