Although Josh Woodward was released from jail early Wednesday, the LA DA says there's not enough evidence to file charges against him yet. "This is a very complicated case. It is a case that will require expert witnesses," said LAPD Deputy Chief Charlie Beck during a press conference. "It is a case that will require extensive scientific analysis of substance." That said, word is police are determined to build a case against Woodward and investigators are working closely with the DA to gather more evidence against him. Murder charges, however, will be tough to come by. "Normally we're looking at the third trimester before a murder charge could really apply," ABC News legal analyst Dana Cole told KABC. "If the fetus could not have survived, it will never be a murder case. It could be an assault case, but it will never be murder."