The Broward State Attorney's Office confirmed Tuesday that the charge against Merling for allegedly attacking his pregnant girlfriend was dropped a day earlier.
The state attorney's office says the girlfriend moved to her parent's home in South Carolina after the alleged incident.
Authorities have been unable to serve her a subpoena to have her return to Florida to testify against him.
A judge wouldn't grant another continuance since the state wasn't able to provide a complaining witness. So, prosecutors say, the state was forced to drop the charge.
The 6-foot-5, 305-pound Merling was arrested in May. Merling had 33 tackles and 2.5 sacks for the Dolphins last season. He remains on the reserve/non-football injury list this season since tearing his left Achilles tendon in July.
Copyright 2010 by The Associated Press