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Aldon Smith‘s loved ones are searching for answers after the former NFL star’s death … revealing they are sending his brain to Boston to determine whether he suffered from CTE.

Smith’s family hired a legal team to help them investigate what may have contributed to his passing at 36 years old … and that features several steps, including having his brain examined for damage caused by concussions and other trauma.

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Smith was found unresponsive in his truck on Saturday after delivering pizzas to the homeless earlier in the day. A cause of death has not been announced.

Pastor Scott Wagers — who interacted with Smith on Saturday — told TMZ the NFLer seemed a little tired, but was otherwise gentle and friendly during their time together.

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Smith entered the NFL in 2011 as a first-round pick … and emerged as a dominant defensive force. Unfortunately, his off-field issues overshadowed his success, and he was suspended several times over the course of his career.

Smith’s family claims he experienced numerous concussions during his NFL career … an injury that has been linked to the degenerative brain disease that causes depression, mood swings and more.

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It can only be diagnosed after death.

As we previously reported, the San Francisco 49ers were devastated by the news … and praised his talent and ability to light up a room.