Eviction needed if lease expired?

[Jonathan C.]

Hi BP,

I had a tenant and their lease expired in April. Been trying to contact them through May and they haven't been returning calls. Also, their mailbox looks like it's been piling up so may not even be at the property anymore. 

If their lease expired in April, do I need to still go through an eviction process or can I just take back the property? 

Also, can anyone let me know how evictions go in Pittsburgh? Or point me to where I can learn more? Thanks!

- Jonathan