TMZ.com: "TMZ spoke with Randy's brother, Lanny Poffo, who tells us the wrestling legend suffered a heart attack while he was behind the wheel around 9:25 AM ... and lost control of his vehicle.
Earlier this month, Savage celebrated his 1-year anniversary with his new wife Lynn.
Savage was 58.
Macho Man began wrestling in the WWF in 1985 and became a superstar with his trademark catchphrase 'Ooooooh Yeaahhhhh.' Savage was so popular, he became the spokesperson for Slim Jim in the mid '90s ... and became virtually synonymous with the brand."