UNDATED -- Get ready for the season finales for many of your favorite NBC shows this spring on Channel 3. Monday Chuck (April 27th from 8 to 9 p.m.) Heroes (April 27th from 9 to 10 p.m.) Medium (May 18th from 10 to 11 p.m.) Tuesday The Biggest Loser: Couples (May 12th from 8 to 10 p.m.) Law & Order: SVU (May 19th from 10 to 11 p.m.) Wednesday Chopping Block (April 29th from 8 to 9 p.m.) Life (April 8th from 9 to 10 p.m.) Law & Order (May 20th from 10 to 11 p.m.) Thursday My Name Is Earl (May 14th from 8 to 8:30 p.m.) Kath & Kim (March 12th from 8:30 to 9 p.m.) Parks & Recreation (May 14th from 8:30 to 9 p.m.) The Office (May 14th from 9 to 9:31 p.m.) 30 Rock (May 14th from 9:31 to 10 p.m.) ER (April 2nd from 8 to 9 p.m. - 1 hour retrospective) ER (April 2nd from 9 to 11 p.m. - 2 hour series finale) Southland (May 21st from 10 to 11 p.m.) Friday Howie Do It (April 24th from 8 to 8:30 p.m. and 8:30 to 9 p.m.) Friday Night Lights (April 10th from 9 to 10 p.m.) Saturday Non...