Late “American Pickers” star Frank Fritz died from a stroke, TMZ has found … this in step with officers.

Based on Frank’s demise certificates, obtained by TMZ, the speedy clarification for demise is “late sequela of cerebral infarction” … medical jargon for a stroke.

The doc says Frank’s lethal stroke was a outcomes of cerebral vascular sickness … a scenario that impacts blood stream and blood vessels inside the thoughts.

Frank moreover suffered from aortic stenosis — a continuous scenario that makes it troublesome for blood to stream from the center to the rest of the physique — and COPD … in step with the certificates, with every circumstances having fun with a job in his demise.

As we reported … Frank died Sept. 30 in a hospice facility inside the Midwest, surrounded by associates, collectively together with his longtime “American Pickers” costar Mike Wolfe.

Frank’s rep beforehand suggested us he died from the implications of a stroke he had numerous years up to now … and that’s confirmed inside the demise certificates.

The paperwork moreover say the official time of demise was 8:50 PM, the model of demise was pure and his physique has since been cremated.

Frank was 60.