LONDON — The chief executive of the SoftBank Group, Masayoshi Son, one of Saudi Arabia’s biggest business partners, has canceled his appearance at an investment conference in Riyadh, the latest fallout from the death of the journalist Jamal Khashoggi, a person briefed on the matter said Tuesday.

Word of Mr. Son’s decision not to attend came on Tuesday, the first day of the conference. A representative for SoftBank, the Japanese internet, energy and financial conglomerate, did not immediately respond to a request for comment

However, Saleh Romeih, an executive with Softbank’s Vision Fund, the biggest technology fund on record, spoke on a panel at the conference on Tuesday, a spokesman for the fund said. The Saudi government is providing $45 billion of the Vision Fund’s nearly $100 billion.

High-profile executives from around the world have pulled out of the conference as the furor has grown over Mr. Khashoggi’s killing this month at the Saudi Consulate in Istanbul.