SAN FRANCISCO (AP) — As hard-hitting safety Donte Whitner headed out of the Bay Area for his hometown of Cleveland, the San Francisco 49ers wasted little time finding someone to fill his position.
Safety Antoine Bethea agreed to a $23 million, four-year contract with the Niners on Tuesday as the NFL's free agency period began, and then the 49ers acquired offensive tackle Jonathan Martin from the Miami Dolphins on Tuesday night to reunite him with former Stanford coach Jim Harbaugh.
Bethea announced on Twitter he had joined the 49ers, saying: "Glad to be a Niner!! Going to the Bay!!!" A person with knowledge of Bethea's contract provided details of the financial terms, speaking on condition of anonymity because they weren't announced and the 49ers had yet to acknowledge the signing.
Also Tuesday, veteran place kicker Phil Dawson received a new two-year contract after a sensational first season in San Francisco. Dawson announced on his Twitter page that he had re-signed, then the team made it formal.
The sides had discussions over the past two weeks.
"My experience being on the inside did nothing but confirm what I already knew to be true, that San Francisco is a super attractive place to play and my experience last season only furthered that notion in my mind," Dawson said. "Coming into free agency, my No. 1 goal was to remain a 49er. Fortunately that was able to work out."
Whitner, meanwhile, announced on Twitter he would join the Browns: "To all my former teammates and coaches. I love you all! I will always cherish you guys!" he wrote.
And linebacker Patrick Willis wrote on Twitter, "Man @DonteWhitner u will be missed G."
For the second straight March, San Francisco watched a top safety leave for a big contract elsewhere. Last year, Dashon Goldson departed for Tampa Bay and 2013 top draft pick Eric Reid replaced him.
The 29-year-old Bethea had 110 tackles, two interceptions and a sack last season, his sixth straight year starting every game for the Indianapolis Colts.
"The thing I love about the 49ers is when they lose someone they pick someone up, which we certainly did that with Antoine," Dawson said. "I'm excited to get to know him and certainly I've followed him through the years. We're going to try to keep on plugging forward and keep on getting better."
The 49ers' secondary also lost cornerback Carlos Rogers after three seasons Tuesday, an expected cost-cutting move by the team. Cornerback Eric Wright posted a photo on his Instagram account via Twitter of a new 49ers contract, but the team didn't confirm he had received a new deal.
San Francisco also acquired quarterback Blaine Gabbert from Jacksonville for a sixth-round draft pick this year and a conditional pick next season, apparently finding a capable backup for Colin Kaepernick. The deal was pending a physical.