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

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

View this post on Instagram

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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