Paz
Crowing
In
order to get rid of parasites in the area where the chickens are walking, you can remove the chickens for 1 day and burn the erea, you can also spill hot water. If you do it twice all parasites are sure to die.I'm sorry to hear he died.
Do check the rest of your flock for lice and mites. If you find any, then it would be good to treat them with. You are in the Philippines, so hopefully you can ask at your local pet shop or feed shop for a suitable product. See if you can fine Zero Mite, but you will need to bath the birds and still find something to treat their housing too. Permethrin based dust or spray is often used in the US.