The Hairspray star's four-month-old puppy, named Angel, went missing in Los Angeles on Monday (04Apr11) and Bynes made a desperate plea to her Twitter.com followers to help locate the pooch.
She stated, "If anyone finds her I beg you to please contact me thru (sic) Twitter, I will give a reward. She means the world to me & I can't find her anywhere."
But Bynes' search has ended in tragedy - little Angel has died.
In a post on the microblogging site on Tuesday evening, the star writes, "Sad day... Little Angel is in heaven now. RIP I love you."