Is Angela a Killer?

Mat matt told police the discussions with arand happened months before the murder, in the thick of the child custody fight over alice. Mat threw angela under the bus on those conversations and said, she's the one that did all the talk. The thing was, nobody really seemed to know if angela committed the murder on her own. Aaron mc craw says that after that call, police brought him in for an interrogation and a polograph - which is what gave him p t s d.