These people were missing from the Oscars' In Memorian

From CNN's Lisa Respers France

The "In Memoriam" segment of last night's Academy Awards caused some viewers grief.

Some questioned why certain late stars were not included, including...

• Luke Perry
• Cameron Boyce
• Tim Conway
• Michael J. Pollard
• Peggy Lipton

Perry's exclusion was an especially sore spot for some given that he appeared in the Oscar-nominated film, "Once Upon a time... in Hollywood."

The "Beverly Hills, 90210" star died last March, following a stroke. He was 52.

Perry and more than 100 others are included in the Oscars In Memoriam section on the organization's website. The televised tribute generally features a range of members from the Academy's 17 branches and previous Oscar winners.

CNN has reached out to the Academy comment on how they select who to include in the broadcast tribute.