SEINFELD BLOG

Just as ER prepares to tee up its series finale, one of its alumni has booked a meaty new gig.

Mekhi Phifer, who for six seasons walked the halls of County General as Dr. Gregory Pratt, has booked a multiple-episode appointment on Fox's Lie to Me.

Phifer will appear on the freshman drama series as Ben Reynolds, an FBI agent who partners with Dr. Lightman (Tim Roth) to track a serial rapist terrorizing the D.C. area.

Reynolds serves as The Lightman Group's government liaison on the case, as he has spent six months pursuing the elusive criminal.