Police are investigating a Rainier Valley assault that left a 29-year-old man dead Wednesday evening, authorities said.

Officers were called to the 6000 block of Martin Luther King Jr. Way South at 8:47 p.m., according to Seattle 911 logs.

Life-saving measures were attempted but the man was declared dead at the hospital, police said. Seattle police spokesperson Officer Valerie Carson declined to say how the man died.

Homicide detectives are now attempting to locate any witnesses in this case. If you have any information, police ask you to call their tip line at 206-233-5000.