diff --git a/classes/observer.php b/classes/observer.php
index ca23a25..61c332f 100644
--- a/classes/observer.php
+++ b/classes/observer.php
@@ -17,6 +17,7 @@
 namespace tool_enrolprofile;
 
 use core\event\course_category_created;
+use core\event\course_category_deleted;
 use core\event\course_created;
 use core\event\course_deleted;
 use core\event\tag_added;
@@ -118,4 +119,17 @@ public static function course_category_created(course_category_created $event):
         $category = $DB->get_record('course_categories', ['id' => $event->objectid]);
         helper::add_item($category->id, helper::ITEM_TYPE_CATEGORY, $category->name);
     }
+
+    /**
+     * Process course_category_deleted event.
+     *
+     * @param course_category_deleted $event The event.
+     */
+    public static function course_category_deleted(course_category_deleted $event): void {
+
+        $categoryid = $event->objectid;
+        $categoryname = $event->other['name'];
+
+        helper::remove_item($categoryid, helper::ITEM_TYPE_CATEGORY, $categoryname);
+    }
 }
diff --git a/db/events.php b/db/events.php
index cf3cc4c..436ff20 100644
--- a/db/events.php
+++ b/db/events.php
@@ -49,5 +49,8 @@
         'eventname' => '\core\event\course_category_created',
         'callback' => '\tool_enrolprofile\observer::course_category_created',
     ],
-
+    [
+        'eventname' => '\core\event\course_category_deleted',
+        'callback' => '\tool_enrolprofile\observer::course_category_deleted',
+    ],
 ];
diff --git a/tests/observer_test.php b/tests/observer_test.php
index 2d2dce4..a9cf281 100644
--- a/tests/observer_test.php
+++ b/tests/observer_test.php
@@ -398,4 +398,52 @@ public function test_course_category_created(): void {
         $conditions = $DB->get_records('tool_dynamic_cohorts_c', ['ruleid' => $rule->id]);
         $this->assertCount(2, $conditions);
     }
+
+    /**
+     * Check logic when deleting a course category.
+     */
+    public function test_course_category_deleted(): void {
+        global $DB;
+
+        $categoryname = 'Category name';
+        $this->assertEmpty($DB->get_record('cohort', ['name' => $categoryname]));
+        $this->assertEmpty($DB->get_field('user_info_field', 'param1', ['id' => $this->categoryprofilefield->id]));
+        $this->assertEmpty($DB->get_record('tool_dynamic_cohorts', ['name' => $categoryname]));
+
+        $category = $this->getDataGenerator()->create_category(['name' => $categoryname]);
+        $course = $this->getDataGenerator()->create_course(['category' => $category->id]);
+
+        // Check everything about category cohort.
+        $categorycohort = $DB->get_record('cohort', ['name' => $category->name]);
+        $this->assertNotEmpty($categorycohort);
+
+        $cohort = cohort_get_cohort($categorycohort->id, \context_coursecat::instance($category->id), true);
+
+        $profilefielddata = $DB->get_field('user_info_field', 'param1', ['id' => $this->categoryprofilefield->id]);
+        $this->assertNotEmpty($profilefielddata);
+        $this->assertTrue(in_array($categoryname, explode("\n", $profilefielddata)));
+
+        $rule = $DB->get_record('tool_dynamic_cohorts', ['name' => $categoryname]);
+        $this->assertNotEmpty($rule);
+        $this->assertEquals($cohort->id, $rule->cohortid);
+        $this->assertEquals(1, $rule->enabled);
+        $conditions = $DB->get_records('tool_dynamic_cohorts_c', ['ruleid' => $rule->id]);
+        $this->assertCount(2, $conditions);
+
+        $enrol = $DB->get_record('enrol', ['courseid' => $course->id, 'enrol' => 'cohort', 'customint1' => $cohort->id]);
+        $this->assertNotEmpty($enrol);
+
+        $category->delete_full(false);
+
+        $categorycohort = $DB->get_record('cohort', ['name' => $categoryname]);
+        $this->assertEmpty($categorycohort);
+
+        $profilefielddata = $DB->get_field('user_info_field', 'param1', ['id' => $this->categoryprofilefield->id]);
+        $this->assertFalse(in_array($categoryname, explode("\n", $profilefielddata)));
+        $this->assertEmpty($DB->get_record('tool_dynamic_cohorts', ['name' => $categoryname]));
+        $this->assertEmpty($DB->get_records('tool_dynamic_cohorts_c', ['ruleid' => $rule->id]));
+
+        $enrol = $DB->get_record('enrol', ['courseid' => $course->id, 'enrol' => 'cohort', 'customint1' => $cohort->id]);
+        $this->assertEmpty($enrol);
+    }
 }