San Antonio cop with 20 years of public service is shot dead execution style in his patrol car while giving a traffic ticket outside police HQ ..Detective Benjamin Marconi, 50, was shot dead in San Antonio on Sunday

Officer was writing a ticket when a man in a black car pulled up behind him

Suspect walked up to passenger window and shot the officer in the head

Police say suspect is a black male wearing a hoodie and baggy pants

A San Antonio police officer has been shot dead in his patrol car while writing a traffic ticket outside police headquarters.
Detective Benjamin Marconi, 50, was sitting behind the wheel of his vehicle when a man pulled up behind him in a black car in downtown San Antonio on Sunday.

The suspect got out and walked up to the patrol car's passenger window and shot Marconi in the head, according to Chief William McManus.
The man then reached into the window and shot him a second time in the head.The suspect got back in his car and fled the scene. Police believe the suspect was driving a black Toyota or Nissan sedan.

Marconi had been on the force for 20 years.
'This is everyone's worst nightmare, the officers in the department, the family and everyone who supports the officers,' McManus said.
'Our hearts go out to all of Detective Marconi's family, to all our SAPD brothers and sisters for whom this has hit home hard.
'Most families will be celebrating the holidays, SAPD will be burying one of its own because of an ultimate act of cowardice by a suspect who will be caught and brought to justice.