Man dies from heart attack on Muni bus after fighting over seat

Riders board a MUNI bus along Market Street in San Francisco, Calif. as seen on Thurs. September 17, 2015. A new survey of city residents by the San Francisco Controller's office asked them to grade local government and a host of departments. The library system scores the best and MUNI scored the worst. less Riders board a MUNI bus along Market Street in San Francisco, Calif. as seen on Thurs. September 17, 2015. A new survey of city residents by the San Francisco Controller's office asked them to grade local ... more Photo: Michael Macor, The Chronicle Buy photo Photo: Michael Macor, The Chronicle Image 1 of / 1 Caption Close Man dies from heart attack on Muni bus after fighting over seat 1 / 1 Back to Gallery

A 75-year-old man suffered a fatal heart attack on a Muni bus in San Francisco after getting into an altercation with a woman over a seat on another bus he had just transferred from, police said Friday.

Police launched a suspicious death and assault investigation following the incident that occurred around 2 p.m. on Thursday.

The man, whose name was being withheld by the medical examiner’s office pending notification of his relatives, died while on a Muni bus at Kearny at Geary streets, said Officer Giselle Talkoff, a spokeswoman for the San Francisco Police Department.

The man went into cardiac arrest and died just moments after he got into a heated dispute with a 53-year-old woman over a seat on another Muni bus, Talkoff said.

The incident remained under investigation Friday and no arrests have been made.