Washington Redskins -- Signed 12 free agents, bringing to 20 the number since the NFL draft to join 11 draft choices and some veterans at minicamp next week. The 12: LB Ricky Adams, Oklahoma State; S Todd Bowles, Temple; LB Shawn Burks, LSU; RB Nathaniel Cole, Morningside (Iowa); C/G Donnie DeYoung, New Mexico; WR Edwin Lovelady, Memphis State; S Tim Morrison, North Carolina; CB Ted Ray, Montana; G Steve Reese, Clemson; G Jeffrey Rosen, Delaware; T Troy Thomas, Northern Iowa; DE Derek Wimberly, Purdue. Detroit Lions -- Signed K Eddie Murray to three-year extension. BASKETBALL

National Basketball Association -- Larry Bird was named player of the year, Patrick Ewing rookie of the year by The Sporting News.San Antonio Spurs -- Red McCombs, who gave up his interest in the club to buy the Denver Nuggets four years ago, then sold that franchise last year, repurchased 20 percent of the Spurs. Utah Jazz -- Redefined duties of Coach Frank Layden, giving him complete authority over personnel, leaving contract negotiations to other officers. BASEBALL

Chicago Cubs -- Waived RHP Dick Ruthven as RHP Lee Smith came off DL. Chicago White Sox -- Brought up LHP Joel McKeon from AAA Buffalo, sent down OF Rodney Craig. St. Louis Cardinals -- RHP Jeff Lahti had arthroscopic surgery on right shoulder, likely to miss six weeks. OBITUARY

Bill Cook, a New York Rangers RW 1926-37 and later the NHL team's coach, died at 90 in Kingston, Ontario. He was elected to the Hockey Hall of Fame in 1952. BOXING

WBA Title Match -- Marvin Johnson will defend his light heavyweight championship against No. 1 contender Jean Marie Emebe in Bermuda June 7. Welterweights -- Mark Breland (11-0) will fight Ricardo Avendao (9-4), May 15 in New York (Felt Forum). TENNIS

D.C. National Bank Classic -- Washington Tennis Patrons announced the final of the tournament at Rock Creek Stadium will be at 7 p.m. Sunday, Aug. 3. There had been some question as to whether the final would be Sunday or Monday night. Tournament opens July 28. GOLF

Tournament Deadline -- May 15, to enter June 16 American Cancer Society of Northern Virginia tournament, switched this year from Chantilly to Springfield G&CC. Entry blanks available via ACS of Northern Virginia or Springfield pro Quin Sullivan. COLLEGES

Southeastern Conference -- Commissioner Boyd McWhorter, 63, citing his health (emphysema), retired. Navy -- Named Maj. Lonnie Messick, USMC, head coach of the lightweight football team; Chuck Bresnahan assistant varsity football coach (offensive ends); Emmett Davis assistant basketball coach. George Washington -- LHP Gregg Ritchie is Atlantic 10 pitcher of the week.