As reported by the Hollywood Reporter:
"ABC's "Life on Mars" won't return for a second season.
The network has decided not to renew the series starring Jason O'Mara as 2008 Detective Sam Tyler working as a cop in 1973 New York.
The series, from 20th TV and ABC Studios, will complete its 17-episode freshman series order with the season finale written as a series finale that will wrap the loose story ends, explain how Tyler got transported back in time and (maybe) bring him back to his own time."
- Jeff L, Sr Staff Writer