Hundreds of people gathered Friday to say goodbye to Ugandan gay rights activist David Kato.

Kato, 43, was found bludgeoned to death with a hammer in his home near Kampala, the nation's capital, CNN reported.

Friends, family, colleagues and diplomats crowded outside Kato's home for the burial. Many of his friends wore t-shirts that said, “The Struggle Continues.”

Secretary of State Hillary Clinton mourned the loss of Kato and urged authorities to investigate and prosecute those responsible.

Friends told the BBC that Kato had received repeated death threats after his name, photograph and address were published in Uganda's Rolling Stone newspaper late last year. The cover story of Uganda's “top 100 homos” included a yellow banner that read “hang them.”

While being gay in Uganda is a criminal offense punishable by life imprisonment in some cases, lawmaker David Bahati has sponsored legislation that includes a death penalty provision for people who repeatedly engage in gay sex and those who are HIV-positive. The bill also bans the “promotion of homosexuality,” which would effectively outlaw political organizations, broadcasters and publishers that advocate on behalf of gay rights.

Kato and his group, Sexual Minorities Uganda (SMUg), had campaigned against the bill and won a legal challenge against the paper.

Campaigners tied Kato's death to his advocacy.

“I'm very angry,” Julius Kaggwa, a human rights advocate, told CNN, “because everybody who knew David knew he was dynamic. … This to me is a hate crime. Really, to put it bluntly, it is a hate crime.”