Mekhi Phifer, best known for his role as Dr. Greg Pratt on NBC's "ER," has filed for bankruptcy, TMZ.com reported yesterday. The 39-year-old actor racked up approximately $1.2 million in back taxes, $50,000 in lawyer fees and $4,500 in back child support, according to court records obtained by TMZ. Legal documents also show he spends around $11,600 in monthly expenses, but pulls in only $7,500.