Having exhausted the extensions of their American visas, Lennon and Ono returned from the US on 15 September 1970. Soon afterwards, Ono miscarried at close to eight months pregnant, and Lennon's equilibrium was tested when his father, Alf Lennon, resumed contact, having recently remarried and become a father again. At Alf's request, they met up at Tittenhurst Park for Lennon's 30th birthday, but Lennon launched into a primal therapy-inspired tirade against him and, according to the account Alf left with his solicitor, threatened to kill him.