Cliff Branch, the former Oakland and Los Angeles Raiders wide receiver who was part of three Super Bowl-winning teams, died Saturday. He was 71.

The Bullhead City (Arizona) Police Department said Branch was found in a hotel room at approximately 3:40 p.m. An initial investigation determined he died of natural causes.

Branch spent all 14 years of his NFL career (1972-85) with the Raiders. A four-time Pro Bowl pick and three-time all-pro selection, he twice led the league in touchdown catches (1974 and '76).

"Cliff Branch touched the lives of generations of Raiders fans," the Raiders said in a statement. "His loss leaves an eternal void for the Raiders Family, but his kindness and loving nature will be fondly remembered forever."

Known as one of the most dynamic deep threats of his era, Branch averaged 17.3 yards per catch in his career.

In Super Bowl XV, his two touchdown catches from Jim Plunkett helped propel the Raiders to a 27-10 win against the Philadelphia Eagles. He also recorded six catches for 94 yards and a touchdown in the Raiders' 38-9 rout of the Washington Redskins in Super Bowl XVIII.

His 1,289 receiving yards in the postseason stands as the fourth-highest total of any player in league history.

Branch ranks third in Raiders franchise history in career receiving yards (8,685), trailing only Hall of Famers Tim Brown and Fred Biletnikoff.

Follow Michael Middlehurst-Schwartz on Twitter @MikeMSchwartz.