Police were called to a report of a man allegedly stabbing a dog in the 9700 block of Oak Street just after 4 p.m. PT Wednesday.
Police say the suspect struggled with officers during their attempts to arrest him, and a Taser was deployed.
After the arrest, Chilliwack RCMP say paramedics took over as the man appeared to be unresponsive. He was pronounced dead at the hospital.
Police say one officer was also injured during the incident, but he was treated at the hospital and released.
The dog that the suspect was allegedly stabbing has also been taken to the vet for treatment.