A Boston Police detective died last Thursday after coming down with the flu, the department and his family said.

Mark Walsh, 51, was rushed to the hospital last week with trouble breathing. He had suffered a cardiac event shortly before arriving at the hospital, but was temporarily in stable condition, his friends wrote in a GoFundMe fundraiser. It has raised more than $166,000 as of Monday, surpassing a $10,000 goal, Boston.com reports.

Walsh died in Beth Israel Deaconess Hospital on Feb. 20 “after a rapid courageous battle with the flu, sepsis and subsequent cardiac trauma,” his family wrote in an online obituary. Walsh’s death was also announced by the Boston Police Department.

Walsh joined the BPD in 2005. He spent time working on the department’s Youth Violence Strike Force and serving in the South End and Dorchester. He was stationed across from the Boston Marathon Finish line in 2013, and was one of the first responders who helped victims of the bombings. Walsh became a detective in 2021 and was assigned to work downtown.

Walsh is survived by his wife Christine and two sons.