FILE - In this Sept. 9, 2018, file photo, Tampa Bay Buccaneers outside linebacker Kwon Alexander (58) tackles New Orleans Saints running back Alvin Kamara (41) in the first half of an NFL football game, in New Orleans. The San Francisco 49ers have agreed to sign linebacker Kwon Alexander to a four-year contract worth $54 million. A person familiar with the contract said the sides came to an agreement Monday, March 11, 2019, soon after teams were allowed to contact pending unrestricted free agents. The person spoke on condition of anonymity because the deal can't be finalized until the new league year starts Wednesday. (AP Photo/Bill Feig, File)