SAN DIEGO — Lyle Menendez, one of the two brothers convicted in the 1989 shotgun slayings of their parents in Beverly Hills, was denied parole by a California review board on Friday in his first appearance before the board. The decision came after his brother, Erik, was denied parole on Thursday. The brothers will be eligible to go before the parole board again in three years.The California Board of Parole Hearings recommendation marks a significant development in the decades-long case that drew international attention, with the brothers’ televised trial becoming one of the most infamous of the 1990s. Lyle, now 57,