quote:
Targeting and Initiating Contact to Head or Neck Area of a Defenseless Player (Rule 9-1-4)

No player shall target and initiate contact to the head or neck area of a defenseless opponent with the helmet, forearm, fist, elbow or shoulder. When in question, it is a foul. (Rule 2-27-14)

Defenseless Opponent is defined as:

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Defenseless player—a player not in position to defend himself.

Examples, include, but are not limited to:

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Examples (Rule 2-27-14):

A player in the act of or just after throwing a pass.
A receiver attempting to catch a pass, or one who has completed a catch and has not had time to protect himself or has not clearly become a ball carrier.
A kicker in the act of or just after kicking a ball, or during the kick or the return.
A kick returner attempting to catch or recover a kick.
A player on the ground.
A player obviously out of the play.
A player who receives a blind-side block.
A ball carrier already in the grasp of an opponent and whose forward progress has been stopped.
A quarterback any time after a change of possession.

This is Interpreting Statutes 101. The elements are met:
1. contact
2. with helmet or shoulder
3. to head or neck area
4. of a defenseless player

There was clear contact to Murray's head by #24's head and/or shoulder (or hands/arms). Murray had slid to his butt, and was a player on the ground, which is one of the non-exclusive, non-exhaustive examples.

But there is more:

Examples of Targeting include, but are not limited to:

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Launch—a player leaving his feet to attack an opponent by an upward and forward thrust of the body to make contact in the head or neck area

A crouch followed by an upward and forward thrust to attack with contact at the head or neck area—even though one or both feet are still on the ground

Leading with helmet, forearm, fist, hand or elbow to attack with contact at the head or neck area

Lowering the head before attacking by initiating contact with the crown of the helmet

So, not making contact, but simply leading with the helmet, which #24 clearly did, is an example of Targeting, even though it is unclear whether #24's head hit Murray, or whether is was his shoulder, arms or hands. The guy was clearly Launching at Murray when Murray was attempting to slide and could have pulled up, just like his teammate #18 did.

The rules and commments can be found here.