RICHARDSON -- Police are investigating a road rage shooting which left one person dead in Richardson.

Officers were called at about 6:30 a.m Thursday for a disturbance on U.S. 75 between Campbell Road and Belt Line. When they arrived they found one person dead inside a vehicle on the side of the road.

<p>A road rage shooting in Richardson in May left one person dead.</p>

The victim was identified by police Thursday afternoon as 27-year-old Robert Klikus.

Police are reviewing video and interviewing witnesses, trying to put the pieces together of what happened.

So far they know the suspect vehicle is white, but they have no other details. Witnesses say they saw the victim and suspect both driving "erratically" on the frontage road before they came to a red light at the Arapaho intersection.

<p>Road rage incident</p>

Words were exchanged, police say, and one shot was fired, going through a window and hitting the victim.

Witnesses say the suspect took off east on Arapaho while the victim drove south on the frontage road before coming to a slow stop.

Richardson Police posted video of the incident on their Facebook page:

If you witnessed anything, you're asked to call Richardson PD.

Klikus' aunt Meg Mueller released the following statement on behalf of his family:

Rob Klikus was a caring young man. He had lost his sister to a car accident six years ago and his mother to a brain tumor three years ago. He had cause to be angry with the world, but had moved to the DFW area in 2015 for a new start. He started out working for the father of a friend, and was working towards his plumber’s license. Rob was a very hard worker, very focused, and often worked seven days a week. He was very respectful, was the only person under 30 who I know who always replied with “Yes, ma’am” and “No, ma’am”, and he’d go out of his way to help a friend. Rob was a private person, preferring to hear another’s story than to tell his own. Rob’s sweet smile and caring nature will be missed.