His \"90210\" love interest Shannen Doherty also spoke out.

\"My friend. Holding you tight and giving you my strength. You got this,\" she wrote.

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My friend. Holding you tight and giving you my strength. You got this.

A post shared by ShannenDoherty (@theshando) on Feb 28, 2019 at 8:49am PST

Ian Ziering added, \"No words can express what my heart feels hearing today's shocking news. Let us all say a prayer for his speedy recovery.\"

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No words can express what my heart feels hearing today's shocking news. Let us all say a prayer for his speedy recovery.

A post shared by Ian Ziering (@ianziering) on Feb 28, 2019 at 9:42am PST

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