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In page Jack Ruby:

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At the time of the shooting, Ruby said that he was taking phenmetrazine (Preludin), a central nervous system stimulant.[1]: 198–199  Ruby also said that he entered the police basement by coming down the Main Street ramp. Later, Ruby expressed remorse to his brother Earl, saying he never wanted Oswald to die.[citation needed] Ruby asked Dallas attorney Tom Howard to represent him. Howard accepted and asked Ruby if he could think of anything that might damage his defense. Ruby responded that there would be a problem if a man by the name of "Davis" should come up. Ruby told his attorney that he "had been involved with Davis, who was a gunrunner entangled in anti-Castro efforts."[3][4]