Tommy Morrison’s career reached its pinnacle on a hot June night in Las Vegas, when he stepped into the ring and beat George Foreman to become heavyweight champion.It reached its nadir when he tested positive for HIV three years later.The last 20 years of the brash boxer’s life would be defined by extensive legal troubles, erratic behavior and mounting health problems. Morrison would later claim that he never tested positive for the virus that causes AIDs, even as he was hospitalized during the last days of his life.Morrison died Sunday night at a Nebraska hospital. He was 44.His longtime promoter and close friend, Tony Holden, confirmed that “the Duke” had died, but his family would not disclose the cause of death.