Grammer: "Mild" Heart Attack

In case you're just tuning in, news outlets are reporting that Kelsey Grammer had a mild heart attack while on vacation in Hawaii over the weekend. Here's the "ET" bulletin. Any reports of Grammer health issues like this in the past? None that I'm aware of, though everything I've seen is using the line "resting comfortably," or something like that.
As you know, Grammer's "Back to You" was dropped by Fox; he was bitterly disappointed by the ax (and tried to get pickup elsewhere.) He's got a gig on ABC's "Roman's Empire."

