Norah O'Donnell will become anchor and managing editor of the "CBS Evening News" and Gayle King is getting two new morning show co-hosts as CBS News seeks to boost the programs' ratings and put a tumultuous, scandal-scarred period behind it.

The changes announced Monday were orchestrated by Susan Zirinsky, a 47-year CBS News veteran who took over in March as the division's president. Her predecessor left after Charlie Rose at "CBS This Morning" and the top executive at "60 Minutes" lost their jobs following misconduct allegations.

"This is a start of a new era for CBS News," Zirinsky said in a statement. "Our job is to reveal America to itself through original reporting, strong investigative journalism and powerful political coverage."