Click photo to enlarge Gypsy Willis, the 37-year-old mistress of
Martin MacNeill, arrives at court Friday, Oct. 25, 2013, in
Provo, Utah. Willis is scheduled to take a much-anticipated turn
on the witness stand. Prosecutors are trying to prove that
MacNeill plotted his wife's 2007 death while carrying on an
affair with the aspiring nursing student. (AP Photo/Rick Bowmer)
PROVO, Utah -- The mistress of a Utah doctor accused of murder
is scheduled to take a much-anticipated turn on the witness
stand Friday.  Prosecutors are trying to prove that Martin
MacNeill plotted his wife's 2007 death while carrying on an
affair with an aspiring nursing student, Gypsy Willis. The
doctor invited her to the funeral, hired her as a nanny and
asked her to marry him weeks later.  Willis, 37, is on probation
for identity fraud charges. Prosecutor Sam Pead called her a
"begrudging" witness who will confirm she had the affair and
insist it's over. The two were separated by MacNeill's jailing
last year.    Early Friday morning, Fo