Baltimore Police Commissioner Kevin Davis said Suiter was shot Wednesday while investigating a 2016 homicide in West Baltimore with his partner.
Detective Sean Suiter, 43, was shot Wednesday evening when he exited his vehicle to speak with a suspect, the Baltimore Post-Examiner reported.
When Suiter approached a suspicious man, the man opened fire, police say.
Sean Suiter, an 18-year veteran of the department, died at a hospital Thursday. ATF, the FBI, Anne Arundel County, private donators and Metro Crime Stoppers are offering a $90,000 reward for information leading to an arrest and conviction of whoever pulled the trigger.
"We remain dedicated and committed to finding the person who ended such a attractive life, such a wonderful detective, husband, father and friend", the police commissioner said.
"We will find the person responsible for this ridiculous, absurd, unnecessary loss of life", said Police Commissioner Kevin Davis. "We are absolutely certain that the community will step up again and stand with the Baltimore Police Department to bring this heartless, ruthless, soulless killer to justice".
She said Baltimore can and will "do better", if all city residents pitch in.
"He may be wounded", Davis says. Davis said police believe one or two people may know or suspect who killed Suiter, and the shooter may have interacted with people in the hours since shooting Suiter. But Davis said tips are steadily coming in and detectives are following leads. We grieve for his loss, and for the pain and suffering that will be endured by his family and friends. Rest in Peace, Brother. $69,000 is the reward that is being offered to anyone with information that can help us solve this case. He was dressed from head to toe, like every other homicide detective in Baltimore is dressed: full suit, tie, badge displayed on his waistband.