Showtime’s “Dexter” killed in its fifth-season opener Sunday, logging the largest premiere audience for the pay cabler in 15 years.

Nielsen estimates that the skein averaged 1.8 million viewers, rising 16% from last year’s premiere, which also aired on the opening Sunday of the television season. Still, it came in below the record 2.6 million that watched “Dexter’s” fourth-season finale last December.

Meanwhile, ratings for HBO’s second installment of “Boardwalk Empire” were unavailable Monday and will be released today. The network also aired the season preems of “Bored to Death” and “Eastbound and Down.”

On the broadcast side, NBC was expected to win the night thanks to its New York Jets-Miami Dolphins contest on “Sunday Night Football,” which averaged a 6.5 rating/16 share in adults 18-49 and 15.9 million viewers overall on the net’s stations from 8:30 to 11. The nationals were expected to rise nicely due to a down-to-the-wire finish, and “SNF” has won the night all three weeks of the football season to date as the franchise continues on a record-setting ratings pace.

Elsewhere, CBS enjoyed a lengthy, 47-minute NFL overrun, so ratings for its primetime lineup weremurky. From about 7:47 to 8:47 p.m., “60 Minutes” looks to come in at approximately a 3.6 rating/10 share in adults 18-49 and 15.1 million viewers overall, followed by similar demo deliveries for the expanded 90-minute season opener of “The Amazing Race” (roughly 3.7/9 in 18-49, 11.5 million viewers overall) and the second-season opener of “Undercover Boss” (3.7/9 in 18-49, 11 million viewers overall).