Bernard McGuirk, host of “Bernie & Sid in the Morning” on radio’s 77 WABC and former executive producer of “Imus in the Morning,” has died. McGuirk, 64, died of prostate cancer Wednesday, 77 WABC announced. Chad Lopez, president of Red Apple Media, which owns the purveyor of conservative talk radio, announced McGuirk’s death on air Thursday, calling him “the backbone of this entire radio station.” McGuirk had hosted “Bernie & Sid In The Morning” with Sid Rosenberg since 2016. In 2007, WFAN and CBS Radio fired McGuirk, the longtime producer of “Imus in the Morning,” and host Don Imus, after the…