Worked at company 22 years. Had a family emergency causing me to miss 4 hours without approval. They let me go and denied unemployment. Legal?

FMLA was used 9 weeks Aug-Oct 2016. Father was flown to Cleveland Clinic for emergency surgery late October. 2 weeks before they determined he would survive. Used remaining FMLA, all available vacation and approved 30-day leave. Told to return Dec 09 at 7am. Sent email to HR that I would be there at 11am due to an appointment. When I arrived they told me to pack my desk. Basically I was let go for missing 4 hours work ( I knew I wouldn't get paid but didn't expect to be fired) after 22 years of employment. No warning verbal or written. HR sent me a note that my leave could not be extended and they suggest I quit and reapply later. Still have emails.