King attended Habersham Central High School in Mount Airy, Georgia alongside teammate Gabe Irby.

He was the RISE Gatorade Georgia Football Player of the Year after finishing his senior season in 2007 with a state-record 1,632 receiving yards and 17 TDs on 99 receptions (16.5 average).

[7] On October 28, 2014, days after being released by Jacksonville when they promoted Peyton Thompson to their active roster, Tampa Bay worked out several wide receivers and signed King to their practice squad.

[11] On January 8, 2017, King scored a touchdown on a 41-yard pass from Eli Manning in the third quarter of the Giants' game against the Green Bay Packers at Lambeau Field in the Wild Card Round of the 2016-17 NFL playoffs.

After the Giants signed wide receiver Brandon Marshall in the 2017 offseason, King changed his jersey number from #15 to #12.

[14] He suffered a concussion in Week 15 and was placed on injured reserve on December 30, 2017, yet he still managed to rack up 240 receiving yards before his injury.