Alec Musser, an actor and model known for his roles in the soap opera “All My Children” and the 2010 movie “Grown Ups,” and who once lived in New Jersey, has at age 50, his fiancé announced Saturday. A cause of death has not been revealed yet, according to reports. Musser played Del Henry on “All My Children” from 2005-07 and also played a masseur on the show “Desperate Housewives” in 2011. Comedy fans may remember him as the muscle-flexing man with the high Canadian accent in Adam Sandler’s “Grown Ups.” Born in New York City in 1973, Musser grew up in New Jersey and Connecticut before moving …