George Zimmerman was today questioned by police after allegedly threatening his estranged wife with a handgun in an altercation sparked by claims he has been having an affair, MailOnline can reveal. Friend and key defense witness John Donnelly told MailOnline: 'George has been having an affair with his ex-fiancee. Shellie believes it flared back up after the acquittal.' Zimmerman was engaged to beautician Veronica Zuazo, who herself filed a domestic violence complaint against him in a messy series of counter complaints that led to their split. Police were called to the Lake Mary, Florida residence owned by Shellie Zimmerman's parents,...