ER - last week? Guest star - kid - Zach - help?

Okay, this is bugging me - who was the actor who played ‘Zach’ on ER recently (I think it was last week’s episode) ?

He was a kid who was at the ER for a head injury, and he had been on a bunch of drugs/medication for a behavioural problem. He looked like he was about 13.

I looked it up on imdb but he didn’t appear to be listed as a guest star.

I’m sure I’ve seen this actor before, and it’s driving me crazy.

Any help?

Never mind … I found out where I’ve seen him before … Jack’s son on Will & Grace. Michael Angarano I think is his name.

How embarrassing …

Yeah, he was Elliott on W&G awhile back. Maybe since his voice changed and he joined the puberty set, they don’t want him around as much because it makes our ever-so-immature and lovable Jack seem too old.