Delete events linked with employee on deletion of Employee

erpnext/hr/doctype/employee/employee.py

@@ -10,6 +10,7 @@ from frappe import throw, _, msgprint
 import frappe.permissions
 from frappe.model.document import Document
 from frappe.model.mapper import get_mapped_doc
+from erpnext.utilities.transaction_base import delete_events
 
 class EmployeeUserDisabledError(frappe.ValidationError): pass
 
@@ -179,6 +180,9 @@ class Employee(Document):
 			frappe.db.sql("""delete from `tabEvent` where repeat_on='Every Year' and
 				ref_type='Employee' and ref_name=%s""", self.name)
 
+	def on_trash(self):
+		delete_events(self.doctype, self.name)
+
 @frappe.whitelist()
 def get_retirement_date(date_of_birth=None):
 	import datetime