Signings -- 3B Jim Presley (Mariners); SS Mariano Duncan (Dodgers); SS Tony Fernandez and P Tom Henke (Blue Jays); and OF Reggie Jackson (Angels). COLLEGES

Northern Illinois -- John McDougal, 136-141 in 10 years as basketball coach, was relieved of his duties and offered reassignment with the athletic department. Jackson State -- Paul Covington, 14-15 this season and 338-197 in 19 years as the school's basketball coach, resigned. Idaho -- Fired Bill Trumbo, 28-59 in three years as basketball coach. North Texas State -- Tommy Newman resigned after three seasons as basketball coach; 24-60 overall, 10-18 this season. Honolulu -- Three college basketball players were arrested in cocaine-dealing investigation. Charged were former Hawaii player Andre Morgan, now at Hawaii Pacific; Hawaii guard Keith Turner, and former Chaminade guard Keith Whitney. BOXING

World Boxing Association -- Tim Witherspoon, who tested positive for marijuana after beating Tony Tubbs for heavyweight title, must give Tubbs a rematch within 90 days and was fined $25,000. BASKETBALL

Los Angeles Lakers -- Signed C Jerome Henderson to 10-day contract to replace F-C Mitch Kupchak, who had knee surgery last week and was placed on injured list.NBA -- Los Angeles Lakers G Magic Johnson was named player of the week. HOCKEY

Boston Bruins -- Acquired D Reed Larson from Detroit for D Mike O'Connell. Toronto Maple Leafs -- D Bob McGill assessed seven-game suspension by NHL for March 1 slashing incident against Detroit.