King attended McDonogh School in Owings Mills, Maryland, and was a three-sport letterman in football, basketball, and track.

As a senior, he had over 1,200 all-purpose yards on offense, and on defense, he added 5 interceptions, and 45 tackles.

In track, he was the private school champion in both the 100 meter dash and the long jump.

Father, Eric King Sr. played basketball for the NAIA national champions Coppin State Eagles in the mid-1970s and professionally in Venezuela.

He spent a postgraduate year at The Hill School[2] King signed with the Cleveland Browns on November 16, 2010.