SANFORD, Fla. -

The attorney for the family of Trayvon Martin, the teen who was shot and killed by neighborhood watchman George Zimmerman, says the family is worried after the announcement of Zimmerman's attorney's stepping down.

Benjamin Crump said the family was shocked when they heard the news on Tuesday that Hal Uhrig and Craig Sonner were stepping down from the case because they couldn't get a hold of Zimmerman.

"His lawyers just told the world.  That is a great concern to Trayvon Martin's parents -- whether he's going to try to avoid facing charges of killing their son," Crump said.

Crump added that the family was hopeful special prosecutor Angela Corey's decision on Monday not to use a grand jury was made because she has enough evidence to make a decision without one. But Crump said the family is more worried that Zimmerman won't be found now.

"The killer of their son is unaccounted for, nobody knows where he's at," Crump said. "It makes them worried more and more that he is never going to be brought to justice."

Speaking to CNN's Piers Morgan, Martin's mother, Sybrina Fulton, reacted to the attorneys' move and said, "They should be close to him and in close contact with him and able to have communication. So it does bother us that they don't know where he is.

"We just want him to be arrested so he can come before a judge and jury," she said. 

Martin was shot and killed in Sanford on Feb. 26 by Zimmerman, who claims self-defense. 

Zimmerman has not been charged in Martin's death, sparking protests across the country.