The actor and politician M. R. Radha and MGR had worked in 25 films together. On 12 January 1967, Radha and a producer visited MGR to talk about a future film project. During the conversation, M. R. Radha stood up and shot MGR in his left ear twice and then tried to shoot himself. After the operation, MGR's voice changed. Since he had been shot in his ear, MGR lost hearing in his left ear and had ringing in the ear problems. These further surfaced in 1983 when he had kidney problems. When Sinnappa Devar paid his first visit to see MGR at the hospital after the shooting incident he paid MGR an advance for MGR's next movie. After getting released from the hospital and finishing Arasakattalai, MGR acted in Devar's movie Vivasaayee against doctors' advice. Due to the operation, MGR's speaking parts in the movie Kaavalkaaran were reduced. This was the only movie in which MGR spoke with old and new voices between scenes: MGR was acting in the film Kaavalkaran in 1967 opposite J. Jayalalithaa when the shooting occurred. Petralthaan Pillaya was the last movie of MGR-MR Radha together. Shooting ended just few days before MGR was shot. The bullet was permanently lodged in his neck and his voice damaged. Within hours of the shooting, some 50,000 fans had gathered at the hospital where MGR had been taken. People cried in the streets. For six weeks, he lay in the hospital as fans awaited each report of his health. He was visited by a steady stream of commoners and luminaries of film industry, polity and bureaucracy. From his hospital bed, he conducted his campaign for the Madras Legislative Assembly. He won twice the number of votes polled by his Congress rival and the largest vote polled by any candidate for the Assembly.

Answer this question "What happened in the 1967 assassination attempt" by extracting the answer from the text above.
During the conversation, M. R. Radha stood up and shot MGR in his left ear twice and then tried to shoot himself.