Who was the hero of the old TV cop series Dragnet

Dragnet
Detective Sergeant Joseph "Joe" Friday is a fictional detective in the Los Angeles Police Department.

The character was created by Jack Webb as the lead for his Dragnet series, and first appeared on June 3, 1949 in the premiere of the NBC radio drama that launched the franchise.

Webb played the character on radio and later television from 1949-1959 and again from 1967-1970, also appearing as Friday in a 1954 theatrical release and a 1966 made-for-TV film that aired three years later.

https://en.wikipedia.org/wiki/Joe_Friday