More than 5000 people are expected to take part in the American Heart Association&rsquo;s Los Angeles County Heart Walk today, Oct. 15 &ndash; many of whom have been affected by heart disease and stroke.  
One of them is Santa Monica Police Sgt. Dean Oshiro who nearly died from a heart attack in August last year.
He said he looked forward to the 5K (3.1 mi...