Apparently.
The bottom line is that Mr. Foster was murdered in a professional hit in a specific DC office (outside the WH) to which he was lured and ambushed. His body was then taken by car to its pre-designed dumping spot at Fort Marcy Park. In fact, his body arrived at FMP before before his car did (according to several eyewitnesses), which completely rules out the "suicide-in-the-park" fabrication.
Although HRC was conveniently out of town at the time of the crime, events following the crime show conclusively that she wasn't surprised at what had happened and she went into immediate cover-up mode. In other words, she was a central figure in a murder conspiracy.
BTW, her participation in a murder conspiracy is not at all inconsistent with her marxist upbringing.