<P> Stephen presents his thesis to the examination board, arguing that a black hole created the universe in a Big Bang, that it will emit heat, and that it will end in a Big Crunch . While celebrating with Jane and his friends, Stephen realises he cannot walk and begins using a wheelchair . </P> <P> After having a second child, a daughter, Stephen develops a theory about the visibility of black holes and becomes a world - renowned physicist . While focusing on the children, Stephen's health and his increasing fame, Jane is unable to work on her own thesis and is frustrated . Stephen tells her he understands if she needs help . She joins the church choir, where she meets widower Jonathan (Charlie Cox). She and Jonathan become close friends, and she employs him as a piano teacher for her son . Jonathan befriends the entire family, helping Stephen with his illness, supporting Jane, and playing with the children . </P> <P> When Jane gives birth to another son, Stephen's mother asks Jane if the baby is Jonathan's, which she denies . Jane sees that Jonathan overheard the conversation and is appalled, but when they are alone they admit their feelings for one another . Jonathan stays away from the family, but Stephen visits him, saying that Jane needs him . </P> <P> While Jane and Jonathan take the children camping, Stephen is invited to attend an opera performance in Bordeaux and contracts pneumonia . While in the hospital, the doctors tell Jane that Stephen needs a tracheotomy, which will leave him unable to speak . She agrees to the surgery . </P>

Actress who played stephen hawkins wife in the theory of everything